From wikipedia:

Brazilian Jiu-Jitsu or Gracie Jiu-Jitsu is a martial art and combat sport and a form of self-defense that focuses on grappling and ground fighting.

It would seem George's death touch was effective. This strip advances two storylines even if you didn't know. George's martial arts training and the new neighbor. Also, George likes melons. Brains are kept in our "melons".